On Fri, Aug 3, 2012 at 11:49 AM, Lee van Cleef <l.van.cleef at gmx.net> wrote: > Hi Michael, > > many thanks for your comment. > > Below the original data as imported from Stata format. Hi Lee, I apologize for being intransigent (well, no -- I actually don't) but could you provide your data using dput() as asked? Best, Michael